Albert ernest jenks



(No Model.)

A. E. JENKS.

WRENCH.

No. 585,443. Patented June 29, 1897.

[7i wiziur 112121 6: @A QWH ALBERT ERNEST JENKS, OF HEATl-FTOVVN,ENG-LAND.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 585,443, dated June 29,1897. Application filed March 30, 1897. $e1'ial No- 629,908. (No model.)

T0 or whont it may concern:

Be it known that I, ALBERT Eanns'r JENKS, a subject of the Queen ofGreat Britain, residing at Heath Town, near Wolverhampton, in the countyof Stafford,England,have invented certain new and useful Improvements inMovable or Adjustable Spanners or Wrenches, of which the following is aspecification.

An adjustable wrench as usually con structed with a screw-and-nutarrangement or other screw contrivance for operating the moving jaw issubject to the inconvenience that the setting of the moving jaw is asomewhat tedious operation and that the Wrench cannot be made so thin orfiat from side to side as is desirable for a portable wrench such as isused by cyclists; and the object of this invention is to provide awrench which shall be of a simple and cheap construction and free fromthe inconvenience experienced in using such wrenches of the ordinarytype.

A wrench constructed according to this invention is illustrated by thedrawings herewith.

Figure 1 is a side elevation of the wrench with one side of the sheathin which the shank of the moving jaw is guided cut away and with thepivot-pin in section. Fig. 2 is an inner or under edge view of thewrench. Fig. 3 is a transverse section through the wrench, taken on line00 showing only the parts which appear in the plane of the section.

A is the fixed jaw of the wrench. It has a shank B, which forms aportion of the wrench-handle.

O is the moving jaw. It has a shank D, which is adapted to slide endwisewithin a sheath E. The sheath constitutes the remaining portion of thewrench-handle and is formed conveniently of sheet metal of the troughshape shown by Fig. 3, having two sides a, which are riveted by means ofrivets b to opposite faces of the shank B, and a part c, which tiestogether the sides a and keeps the sliding shank D in place between thesides.

F is a cam rotatively mounted upon a fixed pin G between extensions ofthe sides roof the sheath. The pin G is mounted in the said extensions.The rear end 01 of the shank D bears on the periphery of the cam F,which has such a foi'm preferably volut-e, as

shown-that when the cam is turned in one direction, while the end d ofthe shank D is in contact with it, it will press the moving jaw 0 uptoward the fixed jaw, and when turned in the opposite direction willmove out of contact with such shank and allow the moving jaw to beopened.

When the wrench is being used to turn a nut or oth er screwed part,thepressure against the moving jaw 0 causes the rear end (1 of the shank Dto press against the periphery of the cam, and the friction therebyoccasioned will usually prevent the cam from turning and consequentlyprevent the moving jaw from yielding; but to insure that the cam shallbe securely held under all circumstances in any position into which itmay have been moved the pin G may be screw-threaded and be provided witha nut e, having a milled edge or otherwise adapted for convenientmanipulation, as clearly shown in Fig. 2. hen the cam has been turnedinto any required position, it may be securely fixed therein by clampingthe backwardly-extended ends of the sides a of the sheath against itsopposite faces by means of the nut c.

When the peripheryof the cam has avolute shape, a shoulder f is formedbetween the portions of greatest and least projection, as shown, and thewrench may be readily set for use with the largest size of nut orbolt-head for which it is adapted by pressing the moving jaw backwardwith one hand to keep the end of the shank D constantly against theperiphery of the cam and turning the cam in the direction of the arrowwith the other hand until the shoulder f comes against the inside orunder side of the end d of the shank.

The main advantage, however, in using a cam of volute shape arises fromthe fact that an entire revolution, or nearly so, of the cam isnecessary to cause the full traverse of the moving jaw inward, and thusthe curve of the periphery of the cam is such as to approximate morenearly to the curve of a circle struck from the center on which the camturns than is the case with cams of other shape and offers more directresistance to the backward pressure of the moving-jaw shank, with theresult that the cam is less liable to turn under such pressure than inthe case of cams of other shape.

to operate said jaw sta-n-tially-as set forth.

Having thus described my invention, I claim. I 1. An adjustable Wrenchor spanner, comprising as its essentials a fixed jaw, a movable jawhaving a shank, a guide for the said shank, and a cam rotatively mountedat the I rear end of the handle of the wrench in the 1 plane of theshank of the moving jaw and adapted to operate the jaw for closing the,jaws, substantially as set forth. 2. An adjustable wrench or spanner,comprising as its essentials a fixed jaw, a movable jaw having a shank,a guide for the said shank, and a volute cam rotatively mounted andadapted to operate the said moving jaw to close the jaws, substantiallyas set forth.

An adjustable wrench or spanner, comprising as its essentials a fixedjaw, .a movable jaW having a shank, a guide for the said shank, a camrotatively mounted at the rear end of the handle of the wrench in theplane of the shank of the moving jaw and adapted for closing the jaws,and means substantially .as described for securing the cam againstrotation when set, subing a shank D, a sheath E, embracing the shank Dand forming a keeper and guide therefor, and a cam F, rotatively mountedbetween rear extensions of the sides of the sheath E, said cam beingadapted to impinge upon the shank of the movable jaw and operate saidjaw by its rotation, substantially as set forth.

5. An adjustable wrench or spanner com- I prising a fixed aw A, having ashank B, a movable jaw 0, having a shank D, a sheetmetal sheath E,embracing the shank of the moving jaw and secured rigidly to the shankof the fixed jaw, said sheath having rear extensions of its sides a, acam F, rotatively ed to impinge upon the shankof the moving jaw tooperate the latter, and means substantiallyas described for clampingfast said cam when it has been set, substantially as set forth.

In itness whereof I have hereunto signed my name in the presence of :twosubseribin g witnesses.

ALBERT ERNEST JENKS. Vitnesses:

ST PHEN WATKINS, ROBERT M. LIs-TER.

4. An adjustable wrenchor spanner com- ;prising a fixed jawA, a movablejaw O, havmounted between said extensions and adapt.

